Percentages and Percentage Change

In this video, the teacher explains how to determine a researcher's sampling method. They discuss the difference between a population and a sample, and the importance of having a representative sample. They explain the concepts of simple...

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Learn the basics about Minerals and Ores from a perspective of the Chemical Sciences.

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In this video, the teacher explains how to calculate conditional relative frequencies by identifying the part and the total. Using examples of squares and a two-way frequency table, the teacher demonstrates how to compute percentages and...

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Many real-world problems involve percentages. This lecture shows how Algebra is used to solve problems involving percent change and profit-and-loss.

When numbers don't tell the full story

Fractions, decimals, and percentages are three ways of representing the same value, so we can convert between them. The decimal value of 1, is the same as 100%. Therefore a percentage value is always 100 times greater than its equivalent...

CSS is great; it's a staple of the web and it helps us to produce beautiful websites, but some parts of it are archaic, and it's often time-consuming to get right. LESS changes that. LESS includes built-in features that allow you...

David Perkins is the Carl H. Pforzheimer, Jr., Professor of Teaching and Learning, Emeritus, at the Harvard Graduate School of Education. He has conducted long-term programs of research and development in the areas of teaching and...

Data… Nowadays information is being collected on everything… we have data coming out of our ears. These numbers might be showing us something very meaningful but who can really tell? This is where bar graphs and pie charts come into...

Converting between different ways of expressing a value.

Last week I talked about the many ways exercise is awesome. This week I want to focus on one way it's not. Weight loss. Sorry, but that's the topic of this week's Healthcare Triage.

This video explains how to solve ratio and percent problems using proportions. It provides examples and demonstrates how to set up known ratios and use the multiplicative relationship within a proportion to find the unknown values. The...

One of the most important processes in science is the art of observing. This video highlights different ways observations are made, emphasizing methods by which students can observe their world. Different types of data, how data is...

The video is about how to read and understand food labels in order to make informed choices about what we eat. The video uses a yogurt container as an example and demonstrates how to interpret the information on the label, including the...

In this video, the teacher explains the difference between percent change and amount of change. They use real-world scenarios to help students understand and decode percent problems. The teacher emphasizes the importance of identifying...

This video explains how to determine associations between the class of passengers on the Titanic and their survival rates. They demonstrate how to calculate conditional relative frequencies and caution against making assumptions based...

In this video, the teacher explains how to solve multistep ratio and percent problems using proportions. They use examples of applying coupons and taxes to demonstrate the concept. The teacher also clarifies the misconception that the...

Percentages are one method of describing a fraction of a quantity. The percent is the numerator of a fraction whose denominator is understood to be one-hundred.